DERL Overview 3 January DERL Overview. January 2011 DERL - 1 -

Transcription

1 Overview January

2 Inputs - Waste Municipal Solid Waste Includes some commercial and civic amenity waste streams DCC, Angus and others. Up to 2,200 T per week Clinical Waste (currently not in use) Predominantly medicines Target 10 T per week - 2 -

3 Outputs - Electricity On full load of 17.0 MWth per boiler the steam turbine generator can produce up to 11 MW gross 7MW exported to National Grid Enough to supply 14,000 homes, i.e. 1/5 th of Dundee population uses 2.2MW to power the plant Export about 500kWh per tonne of waste received - 3 -

4 Outputs - Metals Recovery Ferrous Metals Recovery rate approx 3.9% by weight of incoming waste - sold on for recycling Non-ferrous Metals Recovery rate approx 0.4% by weight of incoming waste - sold on for recycling - 4 -

5 Outputs - Ash Bottom Ash: 2 tonnes / hr recycled and used in road stone preparation and manufacture Cyclone Ash: 1 tonne / hr treated with the filter ash prior to disposal in landfill - work is well advanced to use this in the production of bituminous macadam. Filter Ash : 0.6 tonnes / hr treated prior to disposal at landfill - 5 -

6 EfW Process - 6 -

7 Waste Fuel Treatment TIPPING FLOOR HAMMER MILL MAGNET DELIVERY TRUCK PICKING CRANE Fe FRONT END LOADER FERROUS METAL SKIPS TO RDF STORE Purpose to receive waste into the plant separate unsuitable waste (bulky items only) reduce size to suit fluidised bed combustion remove ferrous metals deliver prepared fuel to RDF store RDF ELEVATOR - 7 -

8 RDF Fuel Store RETURNS CONVEYOR (fuel loop) FILL CONVEYOR SHUTTLING CONVEYOR TO BOILERS (fuel loop) FILL ELEVATOR FROM TREATMENT RECLAIMER SCREW Purpose receive prepared waste from tipping floor store approx 2 days waste fuel recover fuel from store on demand RECLAIMER SCREW COLLECTION CONVEYOR (fuel loop) BELT ELEVATOR - 8 -

9 Boiler Fuel Feed System CHAIN ELEVATOR FROM RDF STORE (part of fuel loop) FLOOD FEED CONVEYOR (part of fuel loop) LOW LEVEL PROBE METERING OR DOSING FEEDER SCALPING ROLL RETURNS CONVEYOR TO RDF STORE (part of fuel loop) LEVELLING ROLL EDDY CURRENT SEPERATOR ROTARY SEAL Purpose receive fuel from store (fuel loop) store small quantity (6 min supply) feed fuel evenly to BFB boiler modulate fuel feed to boiler remove non ferrous metals from fuel seal furnace pressure form atmosphere SLIDE GATE FUEL TO BOILER FEED CHUTE NON FERROUS REJECT - 9 -

10 Steam Turbine DEMIN AND DOSING SYSTEM INLET SYSTEM BFB BOILERS FUTURE STEAM LINE -HEAT SUPERHEATER ECONOMISER CONDENSER Cooling towers TURBINE GEARBOX GENERATOR Purpose Generate revenue through electricity and support plant demand STEAM LINES

11 Pollution Control NOx & CO controlled by combustion in the furnace & flue gas recirculation Dioxin & Heavy metal emissions controlled by active carbon addition Acid gases HCl, SO2 controlled by Lime hydrate addition CEMS Sampling of SO2, HCl, CO O2, NOx, Org DRY REACTOR BFB BOILER ECONOMISER CYCLONE BAG FILTER (compartmented filter cells) FGR Fan FD Fan BOTTOM ASH FLYASH ACTIVE CARBON LIME HYDRATE FLYASH ID Fan REAGENT RECIRCULATION SYSTEM Purpose ensure plant meets EC emission limits SPENT REAGENT

12 tonnes MSW processed - MSW Processed 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10, p Other Perth Angus DCC

13 tonnes MSW Performance - DCC MSW Disposal DCC MSW Disposal 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10, p Landfilled Total

14 Future Challenges Heat and Power Plan SEPA varied PPC Permit appeal unsuccessful Zero Waste Plan Effect on existing waste intake and contracts? Possible extension of catchment area Plant Lifetime Extension Engineering Consultancy Study underway

15 Combined Heat and Power Good Quality CHP Index Favours low grade heat use Difficult to achieve rating without customer demand District Heating Possible heating circuit for local infrastructure Sources of true waste heat exist FG condenser, BA cooling, blowdown and LP turbine exhaust total c. 4MW Industrial Energy Supply Engineering Consultancy Study underway Steam export for base load process use Possible electricity export - once SRO contract terminates

16 Every tonne waste processes Produces 150kg bottom ash (recyclable) 80kg cyclone ash (recyclable) 50kg filter residue (landfill) 3.5kg non ferrous metal recycled 40kg ferrous metal recycled 500kWh export electricity